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EVMS ( http://evms.sourceforge.net/ ) could do some of these things and shared the same vision as ZFS: "EVMS provide[d] a single, unified system for handling all of your storage management tasks." The memory is a bit fuzzy but I think it was a port/reimplementation from AIX or else IBM was involved. I think it died because it didn't integrate well into the kernel (like ZFS it smashed many layers into one).